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Article Open Access

Enhanced effect of nuclear localization signal peptide during ultrasound‑targeted microbubble destruction‑mediated gene transfection

  • Authors:
    • Sheng Cao
    • Qing Zhou
    • Jin‑Ling Chen
    • Nan Jiang
    • Yi‑Jia Wang
    • Qing Deng
    • Bo Hu
    • Rui‑Qiang Guo
  • View Affiliations / Copyright

    Affiliations: Department of Ultrasound Imaging, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
    Copyright: © Cao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 565-572
    |
    Published online on: May 31, 2017
       https://doi.org/10.3892/mmr.2017.6661
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Abstract

Ultrasound‑targeted microbubble destruction (UTMD) can promote the entry of plasmid DNA (pDNA) into the cell cytoplasm, by increasing the permeability of the cell membrane. But the transfection efficiency remains low due to inability of the pDNA to enter the nucleus. Various methods have been explored to improve the UTMD transfection efficiency, but with little success. In cells, the classic nuclear localization signal (cNLS) peptide is an amino acid sequence that signals proteins that are due for nuclear transport. The present study aimed to investigate whether binding of a cNLS peptide to the pDNA may improve the transfection efficiency of UTMD. Four experimental groups were analyzed: Control group (UTMD + pDNA), group with cNLS (UTMD + pDNA + cNLS), group with mutated NLS (mNLS; UTMD + pDNA + mNLS), and group with cNLS and the nuclear import blocker, wheat germ agglutinin (WGA; UTMD + pDNA + cNLS + WGA). The NLS was labeled by fluorescein isothiocyanate, whereas pDNA was labeled with Cy3. Different molar ratios were tested for the NLS and pDNA combination in order to achieve optimal binding of the two molecules. Human umbilical vein endothelial cells were then transfected using the optimum ultrasonic irradiation parameters and NLS/pDNA molar ratio. At 6 h post‑transfection, the rates of Cy3‑labeled pDNA inside the cells and their nuclei were detected by flow cytometry and laser confocal microscopy, and the cellular vs. nuclear uptake of pDNA was calculated. In order to further evaluate the effect of NLS on UTMD‑mediated gene transfection, the transfection efficiency and relative expression levels of mRNA and protein were detected at 48 h post‑transfection. The results demonstrated that the optimal molar ratio of NLS with pDNA was 104:1. The rates of pDNA successful entry into the cell and nucleus were significantly higher in the cNLS group compared with the control group. The transfection efficiency, and relative expression levels of mRNA and protein from the plasmid were significantly increased in the cNLS group compared with the control group. The mNLS group displayed no significant difference compared with the control group, while the WGA group exhibited significant inhibition in most indicators of transfection efficiency compared to the cNLS group. These results suggest that combining a cNLS peptide with pDNA during UTMD‑mediated transfection significantly improved transfection efficiency. Thus, a cNLS peptide may be an important mediator and a new strategy in enhancing the efficiency of UTMD‑mediated gene transfection.
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Copy and paste a formatted citation
Spandidos Publications style
Cao S, Zhou Q, Chen JL, Jiang N, Wang YJ, Deng Q, Hu B and Guo RQ: Enhanced effect of nuclear localization signal peptide during ultrasound‑targeted microbubble destruction‑mediated gene transfection. Mol Med Rep 16: 565-572, 2017.
APA
Cao, S., Zhou, Q., Chen, J., Jiang, N., Wang, Y., Deng, Q. ... Guo, R. (2017). Enhanced effect of nuclear localization signal peptide during ultrasound‑targeted microbubble destruction‑mediated gene transfection. Molecular Medicine Reports, 16, 565-572. https://doi.org/10.3892/mmr.2017.6661
MLA
Cao, S., Zhou, Q., Chen, J., Jiang, N., Wang, Y., Deng, Q., Hu, B., Guo, R."Enhanced effect of nuclear localization signal peptide during ultrasound‑targeted microbubble destruction‑mediated gene transfection". Molecular Medicine Reports 16.1 (2017): 565-572.
Chicago
Cao, S., Zhou, Q., Chen, J., Jiang, N., Wang, Y., Deng, Q., Hu, B., Guo, R."Enhanced effect of nuclear localization signal peptide during ultrasound‑targeted microbubble destruction‑mediated gene transfection". Molecular Medicine Reports 16, no. 1 (2017): 565-572. https://doi.org/10.3892/mmr.2017.6661
Copy and paste a formatted citation
x
Spandidos Publications style
Cao S, Zhou Q, Chen JL, Jiang N, Wang YJ, Deng Q, Hu B and Guo RQ: Enhanced effect of nuclear localization signal peptide during ultrasound‑targeted microbubble destruction‑mediated gene transfection. Mol Med Rep 16: 565-572, 2017.
APA
Cao, S., Zhou, Q., Chen, J., Jiang, N., Wang, Y., Deng, Q. ... Guo, R. (2017). Enhanced effect of nuclear localization signal peptide during ultrasound‑targeted microbubble destruction‑mediated gene transfection. Molecular Medicine Reports, 16, 565-572. https://doi.org/10.3892/mmr.2017.6661
MLA
Cao, S., Zhou, Q., Chen, J., Jiang, N., Wang, Y., Deng, Q., Hu, B., Guo, R."Enhanced effect of nuclear localization signal peptide during ultrasound‑targeted microbubble destruction‑mediated gene transfection". Molecular Medicine Reports 16.1 (2017): 565-572.
Chicago
Cao, S., Zhou, Q., Chen, J., Jiang, N., Wang, Y., Deng, Q., Hu, B., Guo, R."Enhanced effect of nuclear localization signal peptide during ultrasound‑targeted microbubble destruction‑mediated gene transfection". Molecular Medicine Reports 16, no. 1 (2017): 565-572. https://doi.org/10.3892/mmr.2017.6661
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